Common information

Country
Saint Helena
Population
637

Weather, climate, temperature by months in Jamestown

Season Autumn Winter Spring Summer
Month Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Year
Record high, °C 26 25 27 28 32 28 30 32 29 28 26 26 32
Average high, °C 17 17 18 20 21 22 22 21 20 18 17 17 19
Average temperature, °C 16 16 17 18 20 21 21 20 19 17 16 16 18
Average low, °C 15 15 16 17 18 19 19 18 17 16 15 15 17
Record low, °C 11 11 13 13 15 15 15 16 13 12 11 11 11
Rain, days 18 21 19 18 15 18 18 15 16 16 18 20 212
Fog, days 5 4 4 4 4 5 4 3 2 4 4 5 48
Average precipitation, mm. 30 30 20 30 30 60 50 50 40 50 50 40 480
Relative humidity, % 85 90 85 85 85 85 85 85 85 85 85 85 85
Relative humidity morning, % 85 86 87 87 89 90 89 88 85 84 84 85 87
Relative humidity evening, % 78 78 77 75 76 76 77 78 77 77 78 79 77
Wind speed, km/h 27 27 25 25 22 22 25 22 22 25 27 27 25
Day Length, часов 12 13 13 14 13 13 13 12 12 12 12 12 12
Dew point, °C 13 13 13 15 16 17 17 17 15 14 13 12 175
Growing degree-day, °C 192 198 217 267 310 306 336 308 284 233 207 189 3047
Solar radiation, global, Mj/m2 18 20 21 24 26 26 24 21 18 16 16 17 21

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